build(cli): auto-download and link cronet-rs precompiled binaries

Author: root

h3proxy-cli/build.rs

@@ -0,0 +1,85 @@
+use std::env;
+use std::fs;
+use std::path::PathBuf;
+use std::process::Command;
+
+fn main() {
+    if env::var("CARGO_FEATURE_CRONET_BACKEND").is_err() {
+        return;
+    }
+
+    let out_dir = PathBuf::from(env::var("OUT_DIR").unwrap());
+    let target_os = env::var("CARGO_CFG_TARGET_OS").unwrap();
+    let target_arch = env::var("CARGO_CFG_TARGET_ARCH").unwrap();
+
+    let os = match target_os.as_str() {
+        "linux" => "linux",
+        "macos" => "mac",
+        "windows" => "win",
+        _ => return,
+    };
+
+    let arch = match target_arch.as_str() {
+        "x86_64" => "x64",
+        "aarch64" => "arm64",
+        "x86" => "x86",
+        "arm" => "arm",
+        _ => return,
+    };
+
+    let version = "119.0.6045.66";
+    let ext = if os == "win" { "zip" } else { "tar.xz" };
+    let filename = format!("cronet-v{}-{}-{}.{}", version, os, arch, ext);
+    let folder_name = format!("cronet-v{}-{}-{}", version, os, arch);
+    
+    let url = format!(
+        "https://github.com/sleeyax/cronet-binaries/releases/download/v{}/{}",
+        version, filename
+    );
+
+    let archive_path = out_dir.join(&filename);
+    let extract_dir = out_dir.join(&folder_name);
+
+    if !extract_dir.exists() {
+        println!("cargo:warning=Downloading cronet binaries from {}...", url);
+        let status = Command::new("curl")
+            .arg("-L")
+            .arg("-o")
+            .arg(&archive_path)
+            .arg(&url)
+            .status()
+            .expect("Failed to execute curl to download cronet binaries");
+
+        if !status.success() {
+            panic!("Failed to download cronet binaries");
+        }
+
+        println!("cargo:warning=Extracting {}...", filename);
+        if os == "win" {
+            Command::new("unzip")
+                .arg(&archive_path)
+                .arg("-d")
+                .arg(&out_dir)
+                .status()
+                .expect("Failed to execute unzip");
+        } else {
+            Command::new("tar")
+                .arg("-xf")
+                .arg(&archive_path)
+                .arg("-C")
+                .arg(&out_dir)
+                .status()
+                .expect("Failed to execute tar");
+        }
+    }
+
+    println!("cargo:rustc-link-search=native={}", extract_dir.display());
+
+    // Add rpath so the binary can find the shared library at runtime
+    if os == "linux" || os == "mac" {
+        println!("cargo:rustc-link-arg=-Wl,-rpath,{}", extract_dir.display());
+    }
+
+    // Tell cargo to rebuild if this script changes
+    println!("cargo:rerun-if-changed=build.rs");
+}